The overlap for these two events is like 17 people.
That could be. I understand they are not the same. There is more to that, though.
Recently the Minnesota-Wisconsin women's hockey series sold out for the first time, both games. Some people are working to build interest.
I saw U of M students at the game including athletes from other sports attending. So now the other tournament is one less reason for people to not go to a tournament because they are watching the other one. I also saw Wisconsin people there, and outside someone yelled "Go Badgers! Maybe such people would come but instead are at the other.
As for me, I would attend both on Friday and Saturday but cannot because I can only be at one or the other. Some of us do follow multiple sports.
The Minnesota Gophers women's hockey team is a championship-caliber team with players who play for their national teams (like team USA) but still fighting to get more attendance. Everything helps.
And this last point is comical. Ohio State on Friday plays at both tournaments at the same time of day. And if Wisconsin wins their first basketball game they will then play at the same time as the Wisconsin hockey game. You can't go to one and the other. Maybe someone may come to town to see both but now can't. Maybe an entire team would go over to the other tournament after their game but instead they are at the same time. Or maybe someone in town to see one tournament now can't go over to see their school at the other one.
Anyway, attendance will be suppressed. Maybe it's just 17. Maybe it's more. Everything helps or hurts.